NAC 512.010Definitions. (NRS 512.131)As used
in this chapter, unless the context otherwise requires, the words and terms
defined in NAC 512.013 to 512.140,
inclusive, have the meanings ascribed to them in those sections.

(Supplied in codification; A by Div. of Mine
Inspection, 12-2-82; 8-26-83; A by Div. of Industrial Relations by R141-98, 1-28-2000;
R125-08, 5-30-2012)

1. The provisions of NAC
512.150 to 512.178, inclusive, are designed to
protect life, promote health and safety and prevent accidents in mines in
Nevada. These sections apply to all open-pit or underground metal and
nonmetallic mine and sand, gravel and crushed stone operations.

2. These standards do not appear in 30
C.F.R. Parts 55 to 57, inclusive, or in NAC 512.010
to 512.140, inclusive. Therefore, operators should
refer to NAC 512.150 to 512.178,
inclusive, as supplemental to the other applicable federal and state standards
mentioned in this subsection.

3. A violation of a provision of NAC 512.150 to 512.178,
inclusive, subjects the operator or worker to a notice or order pursuant to NRS 512.190.

1. The following federal regulations, as
they existed on May 30, 2012, are hereby adopted by reference:

(a) 29 C.F.R. §§ 1910.134 and 1910.1000; and

(b) 30 C.F.R. Parts 47, 49, 56, 57 and 62.

2. A copy of the regulations may be obtained
from the Department of Business and Industry, Division of Industrial Relations,
Mine Safety and Training Section, 400 West King Street, Suite 210, Carson City,
Nevada 89703, free of charge. The regulations are also available, free of
charge, from the Government Printing Office at the Internet address http://www.gpoaccess.gov/cfr/.

3. Each revision of these regulations shall
be deemed approved by the Division unless the Division disapproves the revision
within 30 days after the date of adoption.

(Added to NAC by Div. of Mine Inspection, eff. 12-2-82;
A by Div. of Industrial Relations by R125-08, 5-30-2012)

1. The operator of every underground mine
shall provide and maintain a ventilation of at least 200 cubic feet per minute
of fresh air for each person working in the mine.

2. Every operator shall do everything
reasonably in his or her power to furnish and encourage the use of any
appliances for allaying dust.

3. The air currents going into underground
working, must, under all conditions, have sufficient volume and velocity to
direct and carry away smoke and harmful gases from blasting, and any other
gases or dusts which might contaminate the atmosphere to a degree in excess of
the accepted minimum.

4. In any underground workings where the
Chief considers it necessary for the welfare of the employees, mechanically
produced and positively controlled air currents must be provided.

5. Internal combustion engines must not be
used underground unless an application for the use has been filed with the
Chief and is approved.

6. If an application to use an internal
combustion engine underground is approved by the Chief, the designated
equipment may be used only so long as it is operated and maintained in
accordance with recommendations made public from time to time by the United
States Bureau of Mines and only upon the condition that whenever safe
conditions of air quality are not maintained, the operator stops operation of
the equipment until proper conditions of air quality are again established,
either by increasing ventilation or by correcting mechanical imperfections in
the equipment, whichever is found to be the cause of the undesirable
conditions.

NAC 512.1543Underground mines: Ground support. (NRS 512.131)The
operator of an underground mine shall use ground support when ground conditions
in the underground mine indicate that ground support is necessary.

(Added to NAC by Div. of Industrial Relations by R125-08,
eff. 5-30-2012)

(a) Develop and maintain a ground support plan that
conforms to the requirements of this section;

(b) Provide training concerning the ground support
plan to each worker who is assigned to perform excavation of the underground
mine;

(c) For each worker who is required to receive
training, keep a written record of the amount and type of training completed by
each worker and the name of the instructor for the training; and

(d) Provide the Enforcement Section with a copy of
the ground support plan and any changes to the plan.

2. The ground support plan must:

(a) Be prepared by the engineering staff that is
employed by or contracted with the operator of the underground mine;

(b) Provide that ground support be designed,
installed and maintained to control the ground where a person may travel or
work in the underground mine;

(c) Provide that any damaged, loosened or dislodged
timbers or steel sets used for ground support that create a hazardous condition
to a person be repaired or replaced before any travel or work is permitted into
that area;

(d) Specify the methods and measures of primary
ground support and secondary ground support that will be used during
underground mine excavation for the development, production or exploration of
ore; and

(e) Provide an engineering plan, map or drawing of
the proposed height and width of mining excavations, including, without
limitation, information relating to:

(1) Geologic strata;

(2) Geologic faults;

(3) Any naturally occurring water encountered;
and

(4) Underground areas that are in horizontal
or vertical proximity to the proposed area of excavation.

3. The ground support plan is subject to the
requirements of 30 C.F.R. § 57.3203, as adopted by reference in NAC 512.151, and any certification required pursuant
to that section must be made available to the Enforcement Section.

4. As used in this section:

(a) “Primary ground support” means ground support
that is designed, engineered, installed and maintained to provide maximum
stabilization of the ground where a person works or travels within an
underground mine, including, without limitation, during the excavation and
extraction process.

1. All main shafts and raises equipped with
hoisting machinery for personnel must be:

(a) Equipped with one compartment that is
partitioned off and set aside as a ladderway;

(b) Equipped with secondary or emergency hoisting
machinery in the main shaft that is supplied by a secondary power supply source
which supplies power to the primary hoisting machinery;

(c) Supplemented with hoisting machinery in an
additional shaft that is supplied by a secondary power supply source which does
not supply power to the main shaft and is connected by not fewer than two
underground passageways to the main shaft or ventilation shaft; or

(d) Connected by a drift or decline to the surface
that does not require hoisting machinery for movement.

2. An operator of an underground mine shall
prepare a written plan to provide a secondary power supply source to a primary
hoisting machine within not more than 8 hours after the failure of a primary
power supply source. The operator shall submit the plan to the Enforcement
Section for approval. Any proposed modification to the plan must be submitted
to and approved by the Enforcement Section before the modification becomes
effective.

3. As used in this section, “secondary power
supply source” means a source of power which is separate from the primary power
supply source and which is constructed and installed or designed for emergency
installation and use in the event of failure of the primary power supply
source.

(Added to NAC by Div. of Industrial Relations by R125-08,
eff. 5-30-2012)

NAC 512.156Repair or adjustment of electrical equipment. (NRS 512.131)All
repairs, adjustments or other work on any type of electrical equipment must be
performed by competent persons.

1. The distance between the top of one rung
and the top of the next rung on ladders must be 12 inches, and the distance
between the centers of the ladder rungs must not exceed 12 inches.

2. Any ladderway which adjoins any chute
compartment must be separated from the chute by a tight partition of sufficient
strength and size to hold rock or other material from running into the
ladderway.

3. When work is being carried on immediately
above any chute ladderway, the ladderway must be protected by a solid bulkhead,
for the protection of employees using the passageway, against falling rock or
material. Entrance to the stope or other working place must be provided at the
side of the ladderway immediately below the bulkhead.

NAC 512.162Haulageways. (NRS 512.131)Haulageways
must be maintained in good condition, free of dips, bumps, obstructions, debris
and dusty or dangerous conditions which may interfere with safe operation of
haulage equipment.

The conveyance must not be moved without a command signal.
When persons are to be hoisted or lowered, they must enter the conveyance and
close the door and then give the signal for the desired level, followed by
“Hoist Persons” (3-1 Bells) or “Lower Persons” (3-2 Bells). Additional signals
are:

For blasting, 3-2-1 Bells, which the hoisting engineer
shall acknowledge by raising and lowering the conveyance slightly.

For an emergency, 9 Bells, followed by ringing the mine
level signal for the level where the emergency exists.

2. One copy of this code of bell signals
must be posted on the gallows-frame, one before the engineer and one at each
station. Other bell signals which are not in conflict with this code may be
used for local conditions, but a table showing such other signals must be
posted in connection with this code.

NAC 512.165Hoisting engineers. (NRS 512.131)Each
hoisting engineer shall inform himself or herself of the safety laws pertaining
to mining and all bell signals used in operating a cage, skip or bucket.

(Added to NAC by Div. of Mine Inspection, eff. 8-26-83)

NAC 512.166Raise climbing machines. (NRS 512.131)Raise
climbing machines, that require driving of raises without maintaining a timbered
passageway close to the face, must not be used, unless an application has been
filed with the Chief and he or she has determined that the particular type of
equipment for which the application has been filed can be safely used.

1. Before any person enters a Cottrell
treater section while it is in operation, the main power supply to the section
must be deenergized, tagged out and locked out where possible and the section
grounded. The section must remain grounded during the period any persons are
within the section.

2. No person may enter a Cottrell, baghouse
or flue where there is a possibility of toxic gas or oxygen deficiency unless
the person is using a breathing apparatus which is approved by the National
Institute for Occupational Safety and Health.

3. No person may enter a baghouse, flue or
chamber while it is under pressure unless emergency rescue equipment is
available and a person trained in its use is stationed at the point of
entrance.

4. Positive tag-out and lock-out procedure
where possible must be followed to prevent anyone from being trapped inside a
Cottrell, baghouse or flue when the doors are closed.

5. All Cottrell rectifiers with exposed high
voltage conductors must be enclosed and the enclosure locked.

6. No person may walk on flues unless
temporary or permanent walkways are provided.

7. All timber removed must, as soon as
practicable, be taken from the mine and not be piled up and permitted to decay
underground.

1. An operator shall provide training to
each worker who will or may come into contact with mercury before the worker is
assigned production work, including, without limitation, training related to:

(a) The health hazards of mercury;

(b) The routes of entry of mercury into a person;

(c) Personal protective equipment;

(d) The effective measures to control mercury; and

(e) The appropriate response to the cleanup of
spills of mercury.

2. In mercury extraction areas or other
areas within the mine where the health and safety of a worker may be at risk
from exposure to mercury:

(a) Hoeing tables must be completely enclosed
except for the frontal opening and provided with mechanical exhaust ventilation
providing a minimum hood face velocity of 100 cubic feet per minute of
ventilation continuously during each shift.

(b) Bottling operations must be as automatic as
possible to reduce unnecessary exposure to a worker. A pan containing a layer
of water must be placed under each mercury flask during the filling of the
mercury flask to catch any spilled mercury.

(c) A polysulfide mercury depressant must be
applied at least once a month to surface areas where mercury may accumulate and
immediately after all mercury spills.

3. At each mill for refining mercury and
each mercury extraction area:

(a) The operator shall provide nonabsorbent, smooth
and impenetrable floors and sidewalls to a height of at least 6 inches under
kilns, cooling towers, hoeing tables, retorts, bottling operations and in any
other area where mercury may be spilled or otherwise accumulate on floors.

(b) General dilution ventilation is required in all
areas where other methods are not adequate to maintain the mercury in air
concentrations below the recommended threshold limit value recommended by the
American Conference of Governmental Industrial Hygienists.

(c) While performing operations where exposure to
mercury vapors in air concentrations may exceed the recommended limit, workers
shall wear devices approved for respiratory protection by the National
Institute for Occupational Safety and Health or the Mine Safety and Health
Administration.

4. “No Smoking” signs must be posted in
mercury extraction areas and other areas where mercury vapors may be present,
and workers are prohibited from smoking or eating except in designated areas.

5. A shower and change room must be provided
for workers who work in mercury extraction areas, along with adequate locker
space for storage of off-duty clothing.

6. The operator shall collect urine samples
monthly from workers who work in mercury extraction areas and where
mercury-bearing ore is processed. The operator shall submit the urine samples
monthly to a medical laboratory for determination of levels of mercury. Workers
with a confirmed Biological Exposure Index value of 35 ug/gCRT or more or a
single sample confirming mercury levels above 45 ug/gCRT must be removed from
further exposure until their levels of mercury return to a normal level of 25
ug/gCRT or less. The operator shall notify the Enforcement Section and take
appropriate action if a worker’s creatinine-corrected level of mercury is found
to be more than 25 ug/gCRT.

7. The operator shall provide annual
physical examinations to any worker for whom a urine sample collected pursuant
to subsection 6 demonstrates that the worker’s level of mercury exceeds 25
ug/gCRT to determine any effects of exposure to mercury vapor.

8. As used in this section:

(a) “Biological Exposure Index” means the
concentration of mercury found in the body of a worker, including, without
limitation, in the urine, blood or exhaled air of the worker, that corresponds
to inhalation exposure at a specific air concentration.

(b) “Medical laboratory” has the meaning ascribed
to it in NRS 652.060.

[Inspector of Mines, Part 1 No. 5 subsec. g, eff. 8-13-75]—(NAC
A by Div. of Mine Inspection, 8-26-83; A by Div. of Industrial Relations by
R125-08, 5-30-2012)

NAC 512.179Exposure to crystalline silica. (NRS 512.131)An
operator shall ensure that no worker is exposed to crystalline silica,
including, without limitation, cristobalite, quartz or tridymite in the form of
respirable dust of more than 0.05 mg/m3 of an 8-hour time-weighted
average.

(Added to NAC by Div. of Industrial Relations by R125-08,
eff. 5-30-2012)

NAC 512.185Execution of notices of violations and orders for withdrawal. (NRS 512.131)A person
so designated by the Chief may sign notices and orders issued pursuant to NRS 512.190.

(Added to NAC by Div. of Mine Inspection, eff. 9-19-90)

SERIOUS ACCIDENTS

NAC 512.190“Serious accident” interpreted. (NRS 512.131, 512.220)As used
in NRS 512.220, the
Administrator will interpret the phrase “serious accident” to include, without
limitation:

1. The death of a person;

2. An injury to a person that has a
reasonable potential to cause death;

3. The entrapment of a person for more than
30 minutes;

4. An unplanned inundation by a liquid or
gas;

5. An unplanned ignition or explosion of gas
or dust;

6. An unplanned fire that is not
extinguished within 30 minutes after discovery;

7. An unplanned ignition or explosion of a
blasting agent or explosive;

8. The unplanned fall of a roof which occurs
at or above the zone of anchorage in active workings where roof bolts are in
use or which impairs ventilation or impedes passage of persons;

9. An outburst of coal or rock that causes
the withdrawal of persons from the mine or the disruption of regular mining
activity for more than 1 hour;

10. An unstable condition at an impoundment,
refuse pile or culm bank that requires emergency action to prevent the failure
of the impoundment, refuse pile or culm bank or causes the evacuation of an
area;

11. The failure of an impoundment, refuse
pile or culm bank;

12. Damage to hoisting equipment in a shaft
or slope that endangers a person or interferes with the use of the hoisting
equipment for more than 30 minutes;

13. Any event that causes death or bodily
injury to a person who is not at the mine when the event occurred; and

14. Damage to haulage or support equipment
used in a mine which endangers a person.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)

1. An operator of a mine shall report a
serious accident that occurs at the mine immediately to the Administrator at
(775) 687-5243.

2. An operator shall:

(a) Investigate any serious accident, occupational
injury or occupational illness that occurs at the mine; and

(b) Submit a report relating to the investigation
to the Administrator within 10 business days after the serious accident, injury
or occupational illness occurs.

3. As used in this section:

(a) “Occupational illness” means an illness or
disease of a worker which may have resulted from working at the mine or for
which an award of compensation is made.

(b) “Occupational injury” means an injury to a
worker which occurs at a mine for which medical treatment is administered, or
which results in death, or loss of consciousness, inability to perform all job
duties on any day after an injury, temporary assignment to other duties, or
transfer to another job.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)

(a) Is licensed in this State to write insurance
for a boiler or pressure vessel; and

(b) Employs or contracts with a special inspector
who has been issued a certificate; or

3. An inspection organization that employs
or contracts with a special inspector who has been issued a certificate.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000; A by R101-02, 12-15-2004)

NAC 512.504“Boiler” defined. (NRS 455C.110, 512.131)“Boiler”
means a closed vessel in which water or another liquid is heated, steam or
vapor is generated or steam is superheated, or any combination thereof, under
pressure or vacuum, for use external to the boiler by the direct application of
energy from the combination of fuels or from electricity. The term includes,
without limitation, a fired unit for heating or vaporizing liquids other than
water if the unit is separate from the processing system and is complete within
itself.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)

3. Is employed or retained as an independent
contractor by an authorized inspection entity.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000; A by R101-02, 12-15-2004)

NAC 512.508“Certificate” defined. (NRS 455C.110, 512.131)“Certificate”
means a certificate to work as a special inspector that is issued by the
Occupational Safety and Health Administration of the Division pursuant to NAC 455C.130.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000; A by R101-02, 12-15-2004)

1. The Boiler and Pressure Vessel Code
of the American Society of Mechanical Engineers with amendments and
interpretations adopted by the Council of the Society and approved and adopted
by the Division;

2. A code relating to the construction of
boiler and pressure vessels that has been approved by the National Board and
adopted by the Division; or

3. The National Board Inspection Code.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)

NAC 512.512“Commission” defined. (NRS 455C.110, 512.131)“Commission”
means the commission issued by the National Board to a person who is authorized
to inspect boilers or pressure vessels.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000; A by R101-02, 12-15-2004)

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)

NAC 512.520“Heat exchanger” defined. (NRS 455C.110, 512.131)“Heat
exchanger” means a device for transferring energy in the form of heat from a
warmer medium to a cooler medium, including, without limitation, a radiator.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)

1. A steam or vapor boiler intended for
operation at pressures not exceeding 15 PSIG; or

2. A hot water boiler intended for operation
at pressures not exceeding 160 PSIG or temperatures of not more than 250°F,

Ê that is not
used to heat potable water except through a heat exchanger.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)

NAC 512.524“High-pressure, high-temperature boiler” defined. (NRS 455C.110, 512.131)“High-pressure,
high-temperature boiler” means a boiler in which water or other liquid is
heated and which is intended for operation at pressures in excess of 160 PSIG
or at temperatures in excess of 250°F. The term includes, without limitation, a
miniature boiler.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)

NAC 512.526“Hot water supply boiler” defined. (NRS 455C.110, 512.131)“Hot
water supply boiler” means a boiler that is completely filled with water that
furnishes hot water to be used outside the boiler at pressures not exceeding
160 PSIG or at temperatures not exceeding 250°F at or near the boiler outlet
and which:

1. Uses a storage tank to supply hot water
to the system;

2. Fires on demand to heat water which is
supplied directly into the system; or

3. Is fired at a rate of not less than
200,000 British thermal units.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)

NAC 512.528“Inspection organization” defined. (NRS 455C.110, 512.131)“Inspection
organization” means an owner or user of pressure-retaining items who maintains
an established inspection program and whose organization and inspection
procedures comply with the National Board Inspection Code and have been
approved by the Enforcement Section.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000; A by R101-02, 12-15-2004)

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000; A by R101-02, 12-15-2004)

NAC 512.534“National Board Inspection Code” defined. (NRS 455C.110, 512.131)“National
Board Inspection Code” means the manual for boiler and pressure vessel
inspectors published by the National Board and adopted by reference in NAC 512.562.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000; A by R101-02, 12-15-2004)

NAC 512.536“New boiler or pressure vessel installation” defined. (NRS 455C.110, 512.131)“New
boiler or pressure vessel installation” means the construction, installation or
placing into operation of or contracting for any boiler or pressure vessel on
or after January 28, 2000.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)

NAC 512.538“Owner or user” defined. (NRS 455C.110, 512.131)“Owner
or user” means any person who is responsible for the safe installation,
operation or maintenance of any boiler or pressure vessel within this State.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)

NAC 512.540“Power boiler” defined. (NRS 455C.110, 512.131)“Power
boiler” means a boiler in which steam or other vapor is generated at a pressure
of more than 15 PSIG. The term includes, without limitation, a high-pressure,
high-temperature boiler and a miniature boiler.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)

NAC 512.542“Pressure vessel” defined. (NRS 455C.110, 512.131)“Pressure
vessel” means a vessel in which pressure is obtained from an external source or
by the application of heat from a direct or indirect source. The term includes,
without limitation, an unfired steam boiler.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)

NAC 512.548“Relief valve” defined. (NRS 455C.110, 512.131)“Relief
valve” means an automatic pressure-relieving device as described in section I,
IV or VII of the Boiler and Pressure Vessel Code of the American Society
of Mechanical Engineers that is used primarily for liquid service.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)

NAC 512.550“Repair” defined. (NRS 455C.110, 512.131)“Repair”
means the work necessary to restore a pressure-retaining item to a safe and
satisfactory operating condition if there is no deviation from the original
design.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)

2. Has a full-opening spring-pop type action
that is used for gas or vapor service.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000; A by R101-02, 12-15-2004)

NAC 512.555“Special inspector” defined. (NRS 455C.110, 512.131)“Special
inspector” means a boiler inspector who holds a certificate and who is employed
or retained as an independent contractor by:

1. An insurance company that is licensed in
this State to write insurance for a boiler or pressure vessel; or

2. An inspection organization.

(Added to NAC by Div. of Industrial Relations by R101-02,
eff. 12-15-2004)

NAC 512.556“Unfired steam boiler” defined. (NRS 455C.110, 512.131)“Unfired
steam boiler” means an unfired pressure vessel or a system of unfired pressure
vessels intended for operation at a pressure in excess of 15 PSIG to produce
and control an output of thermal energy. The term includes, without limitation,
a boiler that heats water with waste heat.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)

NAC 512.558“Water heater” defined. (NRS 455C.110, 512.131)“Water
heater” means a hot water supply boiler or a closed vessel in which water is
heated by the combustion of fuel, electricity or any other source and withdrawn
from the heater for use outside the system of the water heater at pressures not
exceeding 160 PSIG and which includes, without limitation, any control or
device necessary to prevent the water temperature from exceeding 210°F (99°C).

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)

NAC 512.560Authority of Administrator to delegate certain duties. (NRS 512.131)The
Administrator may delegate any duties which the Administrator is assigned
pursuant to NAC 512.500 to 512.594,
inclusive, to the Mine Safety and Training Section of the Division, or its
successor.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)

1. The Administrator hereby adopts by
reference the National Board Inspection Code, 2001 edition and addenda,
and any subsequent edition and addenda issued by the National Board of Boiler
and Pressure Vessel Inspectors, unless the edition or addenda is disapproved by
the Administrator within 60 days after the date the edition is published by the
National Board of Boiler and Pressure Vessel Inspectors. The most current
edition that has been approved by the Administrator may be determined by
contacting the Office of the Administrator. A copy of the 2001 edition may be
obtained from the National Board of Boiler and Pressure Vessel Inspectors, 1055
Crupper Avenue, Columbus, Ohio 43229, for the price of $85.

2. The Administrator hereby adopts by
reference the following sections of the ASME Boiler and Pressure Vessel Code,
2001 edition and addenda, and of any subsequent edition and addenda issued by
the American Society of Mechanical Engineers, unless the edition or addenda is
disapproved by the Administrator within 60 days after the date the edition is
published by the American Society of Mechanical Engineers. The most current
edition that has been approved by the Administrator may be determined by
contacting the Office of the Administrator. A copy of the sections of the 2001
edition and its addenda adopted by reference in this subsection may be obtained
from ASME International, 22 Law Drive, P.O. Box 2900, Fairfield, New Jersey
07007-2900, for the price indicated:

3. The Administrator hereby adopts by
reference Controls and Safety Devices for Automatically Fired Boilers,
CSD-1, 2002 edition, and any subsequent edition issued by the American Society
of Mechanical Engineers, unless the edition is disapproved by the Administrator
within 60 days after the date the edition is published by the American Society
of Mechanical Engineers. The most current edition that has been approved by the
Administrator may be determined by contacting the Office of the Administrator.
This publication applies to automatically fired boilers which are directly
fired with gas, oil, a combination of gas and oil or electricity. The 2002
edition may be obtained from ASME International, 22 Law Drive, P.O. Box 2900,
Fairfield, New Jersey 07007-2900, for the price of $56.

4. The Administrator hereby adopts by
reference the Power Piping Code, B31.1, 2001 edition and addenda, and
any subsequent edition and addenda issued by the American Society of Mechanical
Engineers, unless the edition is disapproved by the Administrator within 60
days after the date the edition is published by the American Society of
Mechanical Engineers. The most current edition that has been approved by the
Administrator may be determined by contacting the Office of the Administrator.
The 2001 edition and its addenda may be obtained from ASME International, 22
Law Drive, P.O. Box 2900, Fairfield, New Jersey 07007-2900, for the price of
$230.

5. The Administrator hereby adopts by
reference the National Fuel Gas Code, ANSI Z223.1/NFPA 54, 2002 edition,
and any subsequent edition issued by the National Fire Protection Association,
unless the edition is disapproved by the Administrator within 60 days after the
date the edition is published by the National Fire Protection Association. The
most current edition that has been approved by the Administrator may be
determined by contacting the Office of the Administrator. The 2002 edition may
be obtained from Global Engineering Documents, 15 Inverness Way East,
Englewood, Colorado 80112, for the price of $69.

6. The Administrator hereby adopts by
reference the National Electrical Code, ANSI/NFPA 70, 2002 edition and
any subsequent edition issued by the American National Standards Institute,
unless the edition is disapproved by the Administrator within 60 days after the
date the edition is published by the American National Standards Institute. The
most current edition that has been approved by the Administrator may be
determined by contacting the Office of the Administrator. The 2002 edition may
be obtained from Global Engineering Documents, 15 Inverness Way East,
Englewood, Colorado 80112, for the price of $284.

7. The Administrator hereby adopts by
reference the Uniform Building Code, 1997 edition, and any subsequent
editions issued by the International Conference of Building Officials, unless
the edition is disapproved by the Administrator within 60 days after the date
the edition is published by the International Conference of Building Officials.
The most current edition that has been approved by the Administrator may be
determined by contacting the Office of the Administrator. The 1997 edition may
be obtained from the International Conference of Building Officials, 5360 South
Workman Mill Road, Whittier, California 90601, for the price of $227.

8. The Administrator hereby adopts by
reference the Uniform Mechanical Code, 2000 edition, and any subsequent
edition issued by the International Conference of Building Officials, unless
the edition is disapproved by the Administrator within 60 days after the date
the edition is published by the International Conference of Building Officials.
The most current edition that has been approved by the Administrator may be
determined by contacting the Office of the Administrator. The 2000 edition may
be obtained from the International Conference of Building Officials, 5360 South
Workman Mill Road, Whittier, California 90601, for a cost of $70.

9. The Administrator hereby adopts by
reference the Uniform Fire Code, 2000 edition, and any subsequent
editions issued by the International Conference of Building Officials, unless
an edition is disapproved by the Administrator within 60 days after the date
the edition is published by the International Conference of Building Officials.
The most current edition that has been approved by the Administrator may be
determined by contacting the Office of the Administrator. The 2000 edition may
be obtained from the International Conference of Building Officials, 5360 South
Workman Mill Road, Whittier, California 90601, for the price of $94.95.

10. The Administrator hereby adopts by
reference the Uniform Plumbing Code, 2000 edition, and any subsequent
edition issued by the International Association of Plumbing and Mechanical
Officials, unless the edition is disapproved by the Administrator within 60
days after the date the edition is published by the International Association
of Plumbing and Mechanical Officials. The most current edition that has been
approved by the Administrator may be determined by contacting the Office of the
Administrator. The 2000 edition may be obtained from the International
Association of Plumbing and Mechanical Officials, 20001 Walnut Drive South,
Walnut, California 91789-2825, for the price of $89.

11. The Administrator hereby adopts by
reference the Standard for the Installation of Oil-Burning Equipment,
ANSI/NFPA 31, 2001 edition, and any subsequent edition issued by the National
Fire Protection Association, unless the edition is disapproved by the
Administrator within 60 days after the date the edition is published by the
National Fire Protection Association. The most current edition that has been
approved by the Administrator may be determined by contacting the Office of the
Administrator. The 2001 edition may be obtained from Global Engineering
Documents, 15 Inverness Way East, Englewood, Colorado 80112, for the price of
$59.

12. The Administrator hereby adopts by
reference the Safety Standard for Refrigeration Systems, ANSI/ASHRAE 15,
2001 edition, and any subsequent edition issued by the American Society of
Heating, Refrigeration and Air-Conditioning Engineers, unless the edition is
disapproved by the Administrator within 60 days after the date the edition is
published by the American Society of Heating, Refrigeration and
Air-Conditioning Engineers. The most current edition that has been approved by
the Administrator may be determined by contacting the Office of the
Administrator. The 2001 edition may be obtained from Global Engineering
Documents, 15 Inverness Way East, Englewood, Colorado 80112, for the price of
$46.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000; A by R101-02, 12-15-2004)

NAC 512.564Requirements for operation. (NRS 455C.110, 512.131)A new
boiler, pressure vessel or water heater must not be operated in this State
unless it is designed, constructed, inspected and installed in accordance with
the Code and the provisions of NAC 512.500
to 512.594, inclusive.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)

1. An unfired pressure vessel that meets the
requirements of the United States Department of Transportation for the shipment
of liquids or gases under pressure.

2. An unfired pressure vessel which has an
inside diameter that does not exceed 6 inches (152 millimeters).

3. An unfired pressure vessel used for
domestic purposes which contains cold water under pressure, including, without
limitation, a vessel containing air, the compression of which serves only as a
cushion.

4. A pressure vessel which contains water
heated by steam or by any other means if none of the following limitations is
exceeded:

(a) An input of heat of 199,999 British thermal
units per hour (58,600 watts);

(b) A water temperature of 210 F (99 C); and

(c) A water capacity of 120 gallons (450 liters).

5. A fired storage water heater that is
directly fired with oil, gas or electricity if none of the following
limitations is exceeded:

(a) An input of heat of 199,999 British thermal
units per hour (58,600 watts);

(b) A water temperature of 210 F (99 C); and

(c) A water capacity of 120 gallons (450 liters).

6. An unfired pressure vessel that does not
exceed 5 cubic feet in volume and 250 PSIG.

7. A hot water heater constructed of
continuous coils, which is used only to produce steam vapor to clean machinery,
equipment and buildings, if:

(a) The tubing or pipe size does not exceed
three-fourths of an inch in diameter and drums and headers are not attached;

(b) The nominal water containing capacity does not
exceed 6 gallons;

(c) The water temperatures do not exceed 350 F; and

(d) Steam is not generated within the coil,

Ê except that
the provisions of NAC 512.500 to 512.594, inclusive, do apply to safety relief valves
on a hot water heater constructed of continuous coils.

9. Any vessel, regardless of its size, that
has an internal or external operating pressure less than or equal to 15 PSIG.

10. As used in this section, “fired storage
water heater” means a hot water supply boiler used to store or directly supply
potable hot water for external use which has:

(a) A 100 percent makeup; and

(b) A firing rate of not less than 200,000 British
thermal units.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)

NAC 512.568Notification of Enforcement Section by insurance company upon
commencement of or change to coverage. (NRS 455C.110, 512.131)An
insurance company shall notify the Enforcement Section within 30 days after the
insurance company commences coverage of or cancels, refuses to renew or
suspends the coverage of a boiler or pressure vessel.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)

1. An internal inspection conducted pursuant
to this section must consist of as complete an examination as can reasonably be
made of the internal and external surfaces of a boiler or pressure vessel while
it is not operating and must not be conducted until any plates for a manhole or
handhole or other closures of openings used for an inspection are removed. An
external inspection conducted pursuant to this section must consist of an
examination of the external surfaces of a boiler or pressure vessel and must be
performed while the boiler or pressure vessel is in operation. An inspection
conducted pursuant to this section must include operational testing of all
controls and safety devices.

2. A power boiler and a high-pressure,
high-temperature boiler must be inspected internally, if the construction and
design of the boiler so allows, at least once each year and externally
approximately 6 months after the date of the internal inspection. If an
internal inspection is not possible, such a boiler must be inspected externally
at least once every 6 months.

3. A low-pressure steam boiler must be
inspected externally at least once every year and internally, if the
construction and design of the boiler so allows, at least once every 2 years.

4. A hot water heating boiler and a hot
water supply boiler must be inspected externally at least once every 2 years
and internally, if the construction and design of the boiler so allows, at the
request of the inspector or special inspector.

5. A lined potable water heater must be
inspected externally at least once every 2 years.

6. Any other fired pressure vessel for which
a frequency of inspection is not specified in subsections 1 to 5, inclusive,
must be inspected internally, if the construction and design of the pressure
vessel so allows, at least once each year.

7. Except as otherwise provided in this
section, a pressure vessel must be inspected externally at least once every 3
years.

8. An inspector or special inspector may
require any boiler or pressure vessel to be prepared for inspection if, in his
or her opinion, an inspection is necessary to determine whether the boiler or
pressure vessel is operating in a safe manner.

9. As used in this section:

(a) “Fired pressure vessel” means a vessel other
than a boiler in which steam or vapor pressure is generated in excess of 15
pounds per square inch by direct firing with a solid, liquid or gaseous fuel or
by an electric heating element.

(b) “Lined potable water heater” means a fired
heater for the storage of water which has a corrosion-resistant lining and is
used to supply potable hot water.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000; A by R101-02, 12-15-2004)

NAC 512.572Procedure upon determination of unsafe condition. (NRS 455C.110, 512.131)If an
inspector or special inspector, upon his or her inspection of a boiler or
pressure vessel, finds that the boiler or pressure vessel or any appurtenance
thereof is in such condition as to be unsafe, the inspector or special
inspector shall immediately notify the owner or user and the Administrator in
writing and, as soon as practicable thereafter, submit to the owner or user and
the Administrator a report on the defects, which states which repairs or other
corrective measures are required. Until the corrections have been made, the
boiler or pressure vessel must not be operated.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000; A by R101-02, 12-15-2004)

NAC 512.573Procedure following accident. (NRS 455C.110, 512.131)If an
accident occurs that renders a boiler, pressure vessel or pressure-retaining
item inoperative, the owner or user shall immediately notify the Enforcement
Section at (775) 684-7085. The owner or user shall investigate the accident and
submit a report relating to the investigation to the Administrator within 10
business days after the accident. Such a boiler, pressure vessel or
pressure-retaining item and any parts thereof must not be removed or disturbed
before an inspection has been made by an inspector or special inspector unless
human life is endangered or except to limit further damage.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000; A by R101-02, 12-15-2004)

1. An inspector or special inspector shall
stamp a boiler or pressure vessel that he or she has inspected and declared
unsafe with the letters “XXX” on each side of the number that indicates the
registration of the boiler or pressure vessel with the National Board or the
number designated by the Enforcement Section. Such a stamp indicates that the
boiler or pressure vessel is condemned.

2. A person shall not use or offer for sale
in this State a boiler or pressure vessel that has been stamped pursuant to
subsection 1.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000; A by R101-02, 12-15-2004)

1. A contractor shall submit a written
notice to the Administrator before installing a boiler or pressure vessel in
this State that is constructed in a manner that meets the standards of this
State, the American Society of Mechanical Engineers or the National Board.
Except for an existing or a reinstalled boiler or pressure vessel, a boiler or
pressure vessel must not be installed in this State unless it has been
registered with the National Board.

2. Except as otherwise provided in
subsection 4, the notice of installation of a boiler or pressure vessel must
include the American Society of Mechanical Engineers’ data report of the
manufacturer concerning the construction of the boiler or pressure vessel, or
an equivalent standard which is approved by the National Board, unless the
boiler is constructed of cast iron.

3. A notice of installation of a new boiler
or pressure vessel must include the plans and specifications of the boiler room
in which the boiler or pressure vessel is being installed which designates the
location of the boiler or pressure vessel and which complies with the
requirements of NAC 512.579.

4. Before a secondhand or portable boiler or
pressure vessel may be installed or shipped for installation into this State,
the owner or user or the contractor installing the boiler or pressure vessel
must submit to the Administrator a notice of installation. The notice of
installation must include, without limitation, a report of inspection. The
report of inspection must be prepared by a person who holds a commission and
who inspected the boiler or pressure vessel. The fittings and appurtenances of
the boiler or pressure vessel must comply with the requirements for the
installation of a new boiler or pressure vessel.

5. As used in this section:

(a) “Existing boiler or pressure vessel” means any
boiler or pressure vessel constructed, installed, placed in operation or
contracted for use in this State before January 28, 2000.

(b) “Portable boiler” means a boiler that is
intended primarily for temporary use and has a construction that allows it to
be moved readily from one location to another.

(c) “Reinstalled boiler or pressure vessel” means a
boiler or pressure vessel removed from its original setting and reinstalled at
the same location or at a new location with or without a change of ownership.

(d) “Secondhand boiler or pressure vessel” means a
boiler or pressure vessel that has changed ownership and has been moved since
its original installation.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000; A by R101-02, 12-15-2004)

1. If a boiler or pressure vessel is removed
from its original site and reinstalled at the same location or reinstalled at a
new location without a change of ownership before reinstallation, the
contractor must submit to the Administrator a notice of installation before
installing the boiler or pressure vessel. The fittings and appurtenances must
comply with the requirements for the installation of a new boiler or pressure
vessel.

2. If a standard boiler or pressure vessel
is to be moved to another state for temporary use or repair, the owner or user
must notify the Administrator in writing before reinstalling the boiler or
pressure vessel within this State.

3. As used in this section, “standard boiler
or pressure vessel” means a boiler or pressure vessel that:

(a) Bears the stamp of the American Society of
Mechanical Engineers or meets a standard of construction approved by the
National Board and adopted by the Division; and

(b) Is registered with the National Board.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)

NAC 512.579Clearance: Generally. (NRS 455C.110, 512.131)Except
as otherwise provided in NAC 512.577 and 512.581, if a boiler is replaced or a new boiler is
installed in an existing or new building, a minimum height of at least 3 feet
must be provided between the top of the boiler, excluding appurtenances, and
the ceiling and at least 3 feet between any side of the boiler and any adjacent
wall or other structure. A boiler or pressure vessel that has a manhole must
have a 5-foot clearance from the opening of the manhole to any wall, ceiling or
piping that will prevent a person from entering the boiler or pressure vessel.
A boiler or pressure vessel must be located so that adequate space will be provided
for the proper operation of the boiler or pressure vessel and its
appurtenances, for the inspection of all surfaces, tubes, waterwalls,
economizers, piping, valves and other equipment, and for the necessary
maintenance and repair and the replacement of tubes. When a pressure vessel is
installed or replaced, there must be an area of unobstructed clearance which is
at least 18 inches wide and provides access for inspection, maintenance and
repair. Clearance for repairs and cleaning may be provided through a door or
access panel into another area if the door or access panel is large enough to
allow the repairs and cleaning to be performed adequately.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)

NAC 512.581Clearance: Fired storage and fired coil water heater. (NRS 455C.110, 512.131)The
clearance between a wall or other structure and a fired storage and fired coil
water heater must be at least that specified by the manufacturer.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)

1. If a valve or any appurtenance of a
boiler or pressure vessel requires frequent manipulation or is so located that
it cannot be reached or operated from the floor, a platform or other safe means
of operation must be provided. If a platform or runway is used, it must be at
least 24 inches wide and be provided with standard handrails and toeboards and
have at least 7 feet 6 inches of headroom. A runway must have at least two
means of exit remotely located from one another and be connected to a permanent
stairway or incline ladder leading to the floor.

2. When necessary for safety, a steel runway
or platform of standard construction must be installed across the tops of
adjacent boilers or pressure vessels or at some other convenient level to
afford safe access. A runway must have at least two means of exit, remotely
located from one another.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)

1. A repair or alteration to a boiler or
pressure vessel must conform to the applicable provisions of the Code or
this chapter, and any jurisdictional requirements.

2. If a repair or alteration to a boiler or
pressure vessel is necessary, an inspector or special inspector must be
consulted regarding the appropriate method for making the repair or alteration.
After the repair or alteration is made, the inspector or special inspector
shall inspect it pursuant to the Code. The person who makes such a
repair or alteration shall submit to the Administrator the appropriate “R” form
prescribed by the National Board within 30 days after completion of the repair
or alteration.

3. A person who makes a repair or alteration
to a boiler or pressure vessel must be qualified pursuant to the National
Board Inspection Code.

4. A person who makes a repair or alteration
to a boiler or pressure vessel by fusion welding to the pressure parts of the
boiler or pressure vessel must hold a valid certificate of authorization and
stamp designated as “R,” which have been issued by the National Board.

5. A repair or alteration made by fusion
welding must not be made to the pressure parts of a boiler constructed of cast
iron.

6. A person who is in the business of
repairing safety valves must have a certificate of authorization from the
National Board for the use of a National Board Pressure Relief Valve Repair
stamp, designated by the National Board as a “VR” stamp.

7. As used in this section, “alteration”
means a change in any item described in the data report from the original
manufacturer for the boiler or pressure vessel which affects the capability of
the boiler or pressure vessel to contain pressure and which includes:

(a) Changes which do not physically alter the
boiler or pressure vessel, including, without limitation, an increase in the
maximum allowable internal or external working pressure in the boiler or
pressure vessel or a change in the temperature at which a boiler or pressure
vessel is designed to be operated; and

(b) A reduction in the minimum temperature of a
boiler or pressure vessel which requires additional mechanical tests.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000; A by R101-02, 12-15-2004)

NAC 512.587Safety appliances: Generally. (NRS 455C.110, 512.131)Each
pressure vessel must be protected by safety or relief valves and indicating and
controlling devices that will ensure its safe operation. These valves and
devices must be so constructed, located and installed that the valves and
devices cannot be rendered inoperative readily. The relieving capacity of
safety valves must be sufficient to prevent a rise of pressure in the vessel of
more than 10 percent above the highest pressure to which any device to relieve
pressure is set, but in no case more than 6 percent above the maximum allowable
working pressure. The opening (set) pressure of the device to relieve pressure
must be no greater than the maximum allowable working pressure of the vessel.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)

1. The capacity of a safety valve that is
designed primarily for steam or vapor service must be rated in pounds per hour.

2. The capacity of a relief valve that is
designed primarily for liquid service must be rated in British thermal units
per hour. The capacity of a relief valve used for liquid service with cold
water may be rated in gallons per hour.

3. The capacity of a safety relief valve
that is designed for use in steam or vapor and liquid service must be rated in
pounds per hour when used for steam or vapor service and in British thermal
units per hour when used for heated liquid service.

4. A pressure relief valve that is used for
air service must be rated in PSIG and square cubic feet per minute.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)

Miscellaneous Provisions

NAC 512.590Qualifications of attendant. (NRS 455C.110, 512.131)A person
is qualified to attend a power boiler or high-pressure, high-temperature boiler
if the person has the technical training, experience and knowledge necessary to
start, operate and shut down the boiler.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)

1. Except as otherwise provided in
subsection 5, a high-pressure, high-temperature boiler and a power boiler must
be attended by a person who meets the qualifications set forth in NAC 512.590.

2. A steam boiler must be attended by a
person who meets the qualifications set forth in NAC
512.590, unless the boiler is equipped with:

(a) A mechanism that cuts off fuel if the level of
water in the boiler or pressure vessel is low;

(b) An automatic feed water regulator;

(c) Fireside regulators and controls;

(d) An audible alarm to indicate low water; and

(e) A pressure control.

3. The attendant shall check personally the
operation of the boiler, the necessary auxiliaries and the level of water in
the boiler at intervals necessary to ensure the safe operation of the boiler
but not less than once every 60 minutes or for intervals in excess of the time
required to evaporate the water from the normal operating level to the lowest
water level permissible if the feed water is shut off or the boiler is forced
to its maximum capacity. A log noting the time of all checks and observations must
be kept in the boiler room.

4. If attendance of the boiler is required
pursuant to this section, a time clock to start or stop the operation of the
boiler automatically must not be used, unless the timing mechanism is a device
or system that has been approved by the Administrator.

5. A high-pressure, high-temperature boiler
and a power boiler do not need to be attended, if the boiler is equipped with
the following protective devices which are functioning properly, as required by
the applicable provisions of Controls and Safety Devices for Automatically
Fired Boilers, CSD-I, which is adopted by reference pursuant to NAC 512.562:

(a) If the boiler is operated at less than
supercritical pressure:

(1) A mechanism that cuts off fuel if the
level of water in the boiler or pressure vessel is low;

(2) An automatic feed regulator;

(3) Fireside regulators and controls;

(4) An audible alarm to indicate low water;

(5) A pressure control; and

(6) A programmed flame safeguard system with
an audible alarm on burners equipped with spark ignition.

(b) If the boiler is operated at supercritical
pressure (3206 PSIG and 705ºF):

(1) All the devices set forth in paragraph
(a);

(2) A cutoff device for high temperature or
fuel; and

(3) An audible alarm to indicate high
temperature.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)

NAC 512.594Contractor’s license required for certain activities. (NRS 455C.110, 512.131)A person
shall not undertake to, or offer to undertake to, install, construct, add to,
subtract from, improve or move any boiler, pressure vessel or water heater
unless the person holds a current contractor’s license issued pursuant to chapter 624 of NRS that authorizes him or
her to install boilers or pressure vessels.

(Added to NAC by Div. of Industrial Relations by R141-98,
eff. 1-28-2000)